There are many exercises that are used as part of the rehabilitation of foot disorders. The aim of these exercises are usually to strengthen and stretch muscles and also mobilise the joints. These are among the many tools that foot specialists make use of to manage a variety of foot problems. One exercise which has been getting a lot of recent attention is one called the short foot exercise. This exercise is done weight bearing and the muscles in the arch of the foot are contracted in order to shorten the foot. This is claimed to strengthen the arch of the foot. If you look at some of the over stated claims online concerning this exercise, it may cure almost everything which could go wrong with the foot, which is certainly far from the truth.
The major problem with this exercise is the blind faith and firm belief that so many have that it might heal so many of the problems that might go wrong with the foot, when there's actually not any scientific data that it's helpful for any foot problems. Simply stating that it is effective and expecting that is it does not ensure it is so. That's the logical fallacy of wishful thinking. For the short foot exercise to be effective it will require time to improve the strength. A lot of conditions get better with time, so there is not any way of knowing if people got better purely because of this natural history or because the exercise does in fact work. That doesn't indicate that there is anything wrong with the exercise and that it must not be used. It could be that the exercise is a really effective and good exercise. It just means that the scientific studies have not been done and too much faith must not be put in any treatment that is lacking in scientific research to underpin its use. Of course keep using the short foot exercise, but apply it in the context of these issues which are well known about it.